Excellent Days for doing Pitru Pooja (or) Pitru Tharpanam: The importance of Ugadi Days: Ugadi = Yuga + Adi. Here the Yuga means the era @ a longer period of time mentioned in the Hinduism. A complete Yuga has 4 age cycle namely 1. Kretha Yuga has 17,28,000 years 2. Treta Yuga has 12,96,000 years 3. Dwapara Yuga has 8,64,000 years 4. Kali Yuga. has 4,32,000 years Adi means beginning @ Ugadi means the start day of an era. Thus the day, when the Kretha Yuga had started is called as "Kretha Ugadi". Similarly the starting day of the Yuga's are called as: 1. Kretha Ugadi 2. Treta Ugadi 3. Dwapara Ugadi 4. Kali Ugadi. 1. Kretha Ugadi: The Kretha Yuga had started on the Sukla Paksha Tritya Thithi in the month of Chaitra (Sanskrit). 2 . Tretha Yuga: The Tretha Yuga had started on the Sukla Paksha Navami Thithi in the month of Kartiga (Sanskrit). 3. Dwapara Yuga: The Dwapara Yuga had started on the Krishna Paksha Tryodasi Thithi in the month of Bha